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Plant Genetics - Medical Science

Q1:

In the meiotic cell divison in daughter cells are produced by two successive division in which

A first division is equational, second is reductional

B first division is reductional and second is equational

C both divisions are reductional

D both divisions are equational

ANS:A - first division is equational, second is reductional

First division is reductional as homologous chromosomes are separated in anaphase 1 (so if there are suppose 8 chromosomes i.e., 4 pair of homologous chromosomes then each daughter cell receives 4 each thereby reducing the chromosome number) whereas the second one is equational as sister chromatids are separated in anaphase 2 and each of the chromatids now behave as chromosome of daughter cell thereby chromosome number remain unchanged i.e., 4.